Effect of environment-assisted cracking on the premature fatigue failure of high-strength valve springs

被引：7
|
作者：
Xing, X. Q. [1 ]
Lu, J. N. [2 ,3 ]
Jian, J. W. [1 ]
Li, L. J. [4 ]
Luo, Z. C. [2 ,3 ]
机构：
[1] Guangzhou Orsa Wire Technol Co Ltd, Zhonggang Grp, Guangzhou 510000, Peoples R China
[2] Guangdong Acad Sci, Inst Mat & Proc, Guangzhou 510000, Peoples R China
[3] Guangdong Prov Key Lab Met Toughening Technol & A, Guangzhou 510000, Peoples R China
[4] South China Univ Techonol, Sch Mech & Automot Engn, Guangzhou 510000, Peoples R China
来源：
ENGINEERING FAILURE ANALYSIS | 2021年 / 126卷
基金：
中国国家自然科学基金;
关键词：
High-strength steels; Valve spring; Fatigue; Residual stress; Environment-assisted cracking; BEHAVIOR; STEEL;
D O I：
10.1016/j.engfailanal.2021.105466
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
In this work, the failure mechanism of four high-strength valve springs were investigated. It shows that the premature fatigue failure of valve spring can be attributed to the presence of an intergranular surface crack formed by the environment-assisted cracking (EAC) mechanism. The surface cracks significantly reduces the fatigue strength to a level of 320-350 MPa, which is much lower than the designed stress (720 MPa). Detailed analysis reveal that the reduced shot peening effect caused by the soft and brittle PbO adhesion contributes to the occurrence of EAC. Furthermore, it suggests that the nucleation and propagation of EAC crack controls the failure process.
引用
收藏
页数：8
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